20280650 has 48 divisors (see below), whose sum is σ = 41669208. Its totient is φ = 7296000.

The previous prime is 20280607. The next prime is 20280661. The reversal of 20280650 is 5608202.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 6345361 + 13935289 = 2519^2 + 3733^2 .

It is a super-2 number, since 2×20280650² = 822609528845000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26270 + ... + 27030.

Almost surely, 2^20280650 is an apocalyptic number.

20280650 is an abundant number, since it is smaller than the sum of its proper divisors (21388558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20280650 is a wasteful number, since it uses less digits than its factorization.

20280650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20280650 is about 4503.4042678845. The cubic root of 20280650 is about 272.7055374934.

Adding to 20280650 its reverse (5608202), we get a palindrome (25888852).

The spelling of 20280650 in words is "twenty million, two hundred eighty thousand, six hundred fifty".